We thank Dr. Renguang Wu for helpful modification for our manuscript. C.-Y. Tam is grateful to Tim Li and Xianan Jiang for discussions in the initial stage of this project at the University of Hawaii. This study was supported by the Special Scientific Research project for Public Welfare (Grant GYHY201006021), the National Natural Science Foundation of China (Grants 40905024 and 40921160379), and the City University of Hong Kong (Grant 7008076).
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